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R. B. PERKINS.

A EXTENSION LAMP FIXTURE. 110.3113779.4 Patented Feb. 3,1885.

UNTTnn STaTns PATENT Cri-Ica RUSSELL B. PERKINS, OF MERIDEN, CONNECTICUT, ASSIGNOR TO EDWARD MILLER'& CO., DE SAME PLACE.

EXTENSION LAMP-FIXTURE.

SPECIFICATION forming part of Letters Patent ANo. 311,779, dated February 3, 1885.

(No model.)

To @ZZ whom it may concern:

Be it known that l, RUssELL B. PERKINS, of Meriden, in the county of New Haven and State of Connecticut, have invented a new Improvement in Extension Lamps; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full` clear, and exact description of the same. and which said drawings constitute part of this specification, and represent, in*- Figure l, a side view ofthe hanger; Fig. 2, an end View; Fig. 3, a horizontal section on line x m through one of the pivots; Fig. 4, the spring as cnt from sheet metal; Figs. and 6, modin'cations.

This invention relates to an improvement in that class of lamps which are suspended by chains running over pulleys near the ceiling, thence down to the weight, commonly called library-lamps,77 and which may be adjusted to various elevations, the weight being employed as a counter-balance for the lamp.

The lamp is usually vprovided with a glass shade of considerable weight, and the edge of this shade is in some cases provided with rings carrying prisms as an ornament. The weight being suspended over the pulleys and the'pulleys free, unless the weight be as much more than the weight of the harp, shade, and lamp, as the weight of the ring and prisms, the application of such ring and prisms over balances the weight to such an extent that they will not remain in the elevated position.

As these lamps go to the trade they are constructed so that the prism-ring may be applied 4or dispensed with, according to the requirements of the purchaser. In some cases the prism is required; in others it is not. If the weight be made sufcient to counterbalance the fixture with the prism-ring, then it is heavier than it should be if the prism-ring is omitted.

The object of my invention is to make a cheap and simple balance, whereby the variation made by the presence or omission of the prism-ring may be compensated for; and it consists in the application of friction-springs to the sides of the pulleys, over which the chains run, such springs being applied around the pivot of the pulley and coupled with the 5o hanger, so as to prevent their rotation with the pulleys, and whereby the spring-pressure is applied directly to the side of the pulley, and as more fully hereinafter described.

A represents the hanger, of usual construction, carrying at each end a pulley, B, upon a pivot, a., the pvot arranged in downwardlyprojecting lugs C C on the hanger. The space between the lugs C C is considerably more than the thickness of the pulley B.. The fric- 6o tion-spring is shown detached in Fig. 4. It is made from elastic sheet metal in the form of a cross with a perforation, b, in the center, corresponding` to the pulley-pivot. The two opposite arms, D D, form friction-springs, which are to bear upon the face of the pulley. They are bent into concavo-convex form, as seen in Fig. 2, and so that the extreme ends will bear upon the side of the pulley, while the back will rest against the lug. The other 7o arms, el d, of the cross form tongues, which, when the spring is applied, are turned outward against the edge of thelugs, as seen in Figs. 2 and 3, and so as to embrace the sides of the lugs and prevent the spring from rotating with the pulley. The springs thus arranged bear upon the opposite surfaces of the pulley and create considerable friction thereo'n. Therefore, if the lamp be provided with the usual counterbalancing-weight,the friction only necessitates 8o the application of a little more powerin pulling down or raising the lamp, the weight serving to hold it at any point of suspension. This applied friction, however, is sufficient to support the ring and prisms attached when 8 5 set upon the shade, the springs resisting the downward tendency of such added weight. The springs thus constructed add but a triiling amount to the cost of manufacture, but adapt the fixture to a great range of variation 9o between the weight ot' the fixture and the counterbalancing-weight.

Vhile I prefer to make the springs in the shape of a cross, so that` the two arms may be turned upon the lugs to prevent rotation, the rotation may be prevented without the arms d d, say as seen in Fig. 5, the hanger constructed with a rib, c, on its face next the pulley, und the spring constructed, as seen i-n Fig. 6, with a depression,f, in its back corresponding to said rib, and which will interlock with the rib and prevent such rotation.

I clztim- 1. In u lump-ixturc, the combination of the 'hanger A, by which the fixture is suspended, pulleys B,arranged in the respective ends ofthe hanger, and sheet-'metal springs D D, arranged upon the pivots of the respective pulleys and between the lugs of the hanger and the side of the pulleys, and so as to bear upon the respeotive sides of the pulley, the said springs being engaged with the lugs of the hanger to' `prevent the rotation 'of the springs, substiur tially as described. d

2. In @lump-fixture, thehanger A. by which the fixture is suspended, combined with the pulleys B, hung iu the respective ends, and the frictionsprings applied at the sides of the pulleys, suid springs being substantially Cross shape and set upon the pivots of the pulleys, two of the arms forming springs on the side ofthe pulley, the other two arms bent upon the hanger, and so as to prevent the rotation ofthe springs with the pulleys, substantially RUSSELL B. PERKINS.

Vitnesses: Y- g VBENJ. KENNARD, GEO. M. GHITTENDEN. 

